In this example Raphael set two different addresses for fxp0 for each RE (.10, .11) and a 'virtual' one (.9) which reside only on the master RE.

I do not recommend the use of fxp0, (rather use in -band management, and serial oob in case of failure), unless you are totally sure of your management network.

--
Raphael Mazelier

Le 09/05/2016 à 14:19, Raphael Maunier a écrit :
Here the config for the 2 re
groups {
     re0 {
         system {
             host-name re0.mx1.fqdn;
         }
         interfaces {
             fxp0 {
                 unit 0 {
                     family inet {
                         address 10.10.10.9/24 {
                             master-only;
                         }
                         address 10.10.10.10/24;
                     }
                 }
             }
         }
     }
     re1 {
         system {
             host-name re1.mx2.fqdn;
         }
         interfaces {
             fxp0 {
                 unit 0 {
                     family inet {
                         address 10.10.10.9/24 {
                             master-only;
                         }
                         address 10.10.10.11/24;
                     }
                 }
             }
         }
     }

And then apply-group [re0 re1]





Raphael

On 09/05/16 14:11, "juniper-nsp on behalf of v" 
<juniper-nsp-boun...@puck.nether.net on behalf of vekt...@gmx.net> wrote:

Hello,

I am new to networking and trying to understand the initial configuration on a 
Juniper MX router with dual REs:
http://www.juniper.net/techpubs/en_US/junos14.2/topics/task/configuration/routing-engine-dual-initial-configuration.html

Step 6 is the following:
" Set the loopback interface address for the re0 configuration group:
[edit groups]
root@host# set re0 interfaces lo0 unit 0 family inet address 
address/prefix-length"

Why do I need to give the re0 group a loopback interface address in the first 
place?
What address should I give to the loopback interface?

Regards,
v
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